Mtrzd Damper, For Fan Dia. 54", 24-240V, DAYTON, Mfr# 3C188

57 In.H-W 12.8 In.L Squ Alu Mtrzd Cntrl Dampr, For Nominal Duct Diameter Not Applicable, Damper Application Motorized, Number of Panels 2, Overall Height 57 in, Overall Length 12 3/4 in, Rough Opening Shape Square, For Duct Shape Square, Overall Width 57 in, Frame Material Thickness 0.1 in, Blade Material Aluminum, Maximum Air Pressure 4 in wg, Overall Diameter 57 in, Rough Opening Length 55 in, Rough Opening Width 55 in, Damper Type Dynamic, Maximum Air Velocity 3500 fpm